Scale of the proposed mine at Cochrane Hill Data gathered by Karen McKendry, Ecology Action Centre and Dale Archibald.
Information below is taken from the full project description, but numbers and calculations are calculated.
Mine is currently proposed to operate from 2021 to 2027 (six years), and may employ up to 220 people.
Size of the pit: – 950m long x 450m wide x 170m deep (at current mining scenario). Volume = 72,675,000 meters3 if calculated as a cube.
An Olympic-size swimming pool = length 164 feet (50 meters) x width 82 feet (25 meters) x depth 7 feet (2 meters)(minimum). The volume of the pool is 2500 m3.
172,675,000 m3/2500m3 = 29,070 Olympic sized pools
29,000 Olympic-sized swimming pools! = Over 4 times the volume of Lochiel Lake on Route 7
Amount of ore removed: – 43.1 million tonnes of rock will be excavated – 22,086 tonnes per day – Will produce 2 million tonnes of gold-bearing ore per year (= 11.2 million tonnes of ore at 1.10g/t Au?).
How much gold will be produced? 11.2 million tonnes x 1.1 g/tonne = 12,320kg of gold. 1 gold bar = 12 kg, so 12,320kg = approx. 994 gold bars.
What is the value of 994 gold bars?
1 Troy ounce of gold weighs 31.1 g and is worth approximately $1300 US today. 1 gold bar weighs 400 troy ounces. 1300 x 400 = $520,000 US. The production of 994 gold bars would gross Atlantic Mining NS Inc. 994 x $520,000 = $516,880,000 dollars US or $692,000,000 Cdn.
What is the cost to produce this volume of gold?
Production costs(Quoting Atlantic Gold in the Feb. 14, 2019 Chronicle Herald article) were estimated at $692 an ounce at Cochrane Hill. This means profit of approximately $600/Troy oz or 1300 x 600= $780,000US. This is an incredible amount of money for operating 6 years.
Amount of tailings created at Cochrane Hill: – A waste rock storage facility with the capacity to hold 11.6 million tons, as well as a tailings management facility (TMF) with a design storage capacity of 8.6 Mm3 of tailings solids – The waste rock pile will be between 10m and 40m above the existing ground surface – There will also be a low-grade ore pile during the life of the project, up to 25m in height and 2.1 million tons in capacity.
Amount of blasting: – Blasting will occur 2 – 3 times per week – Noise and vibration from blasting and equipment to be modeled by the proponent.
Number of trucks: – 175 tons per day of gold concentrate to be transported – Trucks will travel along Highway 7 (97km), through Sherbrooke and Sheet Harbour, then additional 41km on secondary highway and roads. – A 2.9km section of highway 7 is proposed to be moved.
Amount of water needed: – Start up will require 300,000m3 to 500,000 m3 – Daily raw water withdrawal is expected to be in the range of 50m3 /day (= 50,000L/day) – A water withdrawal approval is needed for water withdrawals greater than 23,000L/day. – Water to be taken from Archibald Lake or the St. Mary’s River Power needed: –
Power:-Upgrade needed to 4km of existing power line, plus 9km of additional line needed.